Distribution of demographic and clinical variables for the cohort of 681 patients by whether they presented tuberculosis recurrence or not and the probability (raw risk) of having tuberculosis recurrence, Barcelona 1995–2005
| Variables | Recurrence 29 (4.3%) | No recurrence 652 (95.7%) | HR (95% CI) | p value |
| Sex | ||||
| Female | 3 (10.3) | 217 (33.3) | 1 (–) | – |
| Male | 26 (89.7) | 435 (66.7) | 4.3 (1.3 to 14.3) | 0.016 |
| Age (median and IQR) | 34 (25.5 to 38.5) | 36 (28 to 52) | 0.98 (0.97 to 1.01) | 0.12 |
| Country | ||||
| Autochthonous | 24 (82.8) | 603 (92.5) | 1 (–) | – |
| Foreign born | 5 (17.2) | 49 (7.5) | 2.5 (0.94 to 6.5) | 0.06 |
| IDU | ||||
| No | 18 (62.1) | 554 (85) | 1 (–) | – |
| Yes | 11 (37.9) | 98 (15) | 3.6 (1.7 to 7.6) | 0.001 |
| HIV positive | ||||
| No | 17 (58.6) | 512 (78.5) | 1(–) | – |
| Yes | 12 (41.4) | 136 (20.9) | 2.8 (1.3 to 5.8) | 0.007 |
| Unknown | 0 (0) | 4 (0.6) | – | |
| Inner city district | ||||
| No | 22 (75.9) | 535 (82.1) | 1 (–) | – |
| Yes | 7 (24.1) | 117 (17.9) | 1.5 (0.64 to 3.5) | 0.35 |
| Smoker | ||||
| No | 7 (24.1) | 296 (45.4) | 1 (–) | – |
| Yes | 22 (75.9) | 341 (52.3) | 2.6 (1.1 to 6.2) | 0.025 |
| Unknown | 0 (0) | 15 (2.3) | – | |
| Alcoholic | ||||
| No | 16 (55.2) | 469 (71.9) | 1 (–) | – |
| Yes | 13 (44.8) | 169 (25.9) | 2.4 (1.1 to 4.9) | 0.022 |
| Unknown | 0 (0) | 14 (2.1) | – | |
| Homeless | ||||
| No | 27 (93.1) | 610 (93.6) | 1 (–) | – |
| Yes | 2 (6.9) | 39 (6) | 1.21 (0.29 to 5.1) | 0.8 |
| Prison | ||||
| No | 23 (79.3) | 604 (92.6) | 1 (–) | – |
| Yes | 6 (20.7) | 47 (7.2) | 3.5 (1.4 to 8.6) | 0.006 |
| Unknown | 0 (0) | 1 (0.2) | – | |
| Mixed TB | ||||
| No | 22 (75.9) | 598 (91.7) | 1 (–) | – |
| Yes | 7 (24.1) | 54 (8.3) | 3.2 (1.3 to 7.9) | 0.01 |
| Smear test | ||||
| Negative | 10 (34.5) | 357 (54.8) | 1 (–) | – |
| Positive | 19 (65.5) | 295 (45.2) | 1.5 (0.7 to 3.2) | 0.29 |
| Resistance | ||||
| No | 28 (96.6) | 603 (92.5) | – (–) | – |
| Primary | 0 (0) | 30 (4.6) | ||
| Secondary | 1 (3.4) | 11 (1.7) | ||
| Unknown | 0 (0) | 8 (1.2) | ||
| MDR TB | ||||
| Yes | 0 (0) | 7 (1.1) | – (–) | – |
| No | 0 (0) | 641 (98.3) | ||
| Unknown | 0 (0) | 4 (0.6) |
HIV, human immunodeficiency virus; IDU, intravenous drug user; IQR, interquartile range; MDR TB, multidrug-resistant tuberculosis.